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<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>

<body>
  <script>
    //自定义随机颜色函数
    function getRandomColor(flag) {
      //如果是ture返回#ffffff
      if (flag) {
        let arr = ['0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f']
        let col = '#';
        for (let i = 0; i < 6; i++) {
          let a = (Math.floor(Math.random() * arr.length))
          col = col + arr[a]
        }
        return col
      } else { //如果是false返回#rgb(255,255,255)
        let r = Math.floor(Math.random() * 256)
        let g = Math.floor(Math.random() * 256)
        let b = Math.floor(Math.random() * 256)
        return `rgb(${r},${g},${b})`
      }
    }
    console.log(getRandomColor(true));
    console.log(getRandomColor(true));
    console.log(getRandomColor(true));
    console.log(getRandomColor(false));
  </script>
</body>

</html>